When you consider the soot buildup, the dusty or poorly lubricated fans, the flickering pilot lights, and those loose fan belts, they can add hundreds to your heating costs each year. I recommend getting your furnace tuned up regularly. The maintenance can do wonders for both your wallet, not to mention your overall comfort. Your system should be serviced every two to three years and to make it even more efficient, prevent heated air from leaking into your attic or crawl spaces by sealing your ductwork with mastic duct sealant-a nontoxic, paint-on material-or foil-backed tape. Doing so will reduce your home's air leakage and could save you a bundle in heating and cooling bills.
Cost: $100 (mastic and tape) Payback: one heating season.